wiring issues to starter on Ford 3600

Tractor virgin · Oct 14, 2014

my ignition switch recently failed and I replaced it with an after market switch. I originally thought it only had the two positiions and when wired to start I had to click it back to the first position to disengage the starter. A friend of mine used the tractor not knowing and as you can guess ate up the starter. The starter has been replaced and I also found out the ignition switch does have a spring back to disengage the starter and I have rewired it but the tractor still does not start. I can jump the solonoid and it cranks so I assume I'm not completing the start circuit. I'm hoping there is a fuse somewhere but haven't looked yet, can anyone help with that answer. It's a 1977 Ford 3600 diesel, thanks.

Steve@Advance · Oct 14, 2014

Might want to go back and double check the wiring on the switch. The terminals should be labeled. You'll need a test light.

With the switch off, the "Bat" terminal should have power.

First click to right should have power to the "Bat", "Ign", and "Acc" terminal(if used).

Turn to spring loaded position, "Bat", "Sta" and "Ign" should have power.

Also check the neutral switch, it should have power to both terminals when in start position and in neutral.

If all is correct you should have power to the "S" terminal of the starter solenoid when the switch is turned to start.

Tractor virgin · Oct 14, 2014

thanks for the info. What confuses me is my positive cable goes onto one of the solenoid posts and the negitive cable to the starter moter. On the second solenoid post are two red wires which at least one has continuity back to the ignition switch but if that wire had power to it, it would bypass the solenoid and start the tractor. How does my 12v power get back to the ignition switch from the solenoid?
by the way, Batt stamped on the switch would have been great, I've got 1-5 and had to ohm out my posts to figure out which wire went where

John_PA · Oct 22, 2014

(quoted from post at 18:18:03 10/14/14) thanks for the info. What confuses me is my positive cable goes onto one of the solenoid posts and the negitive cable to the starter moter. On the second solenoid post are two red wires which at least one has continuity back to the ignition switch but if that wire had power to it, it would bypass the solenoid and start the tractor. How does my 12v power get back to the ignition switch from the solenoid?
by the way, Batt stamped on the switch would have been great, I've got 1-5 and had to ohm out my posts to figure out which wire went where

I just noticed your reply to this post- off the ford forum...

You have the answer right there. you must have a 3 post solenoid, not the original 2 post. just take the 2 red wires off the 3rd solenoid post, and put them on the post with the + batt cable.

Does it look like this?

or like this?

There is a small copper fusable link between the posts that can burn out. or sometimes is not on the starter solenoid when new... that wipe them out along with long cranking with mild arching from sitting outside in the weather. At any rate, if you just put all the wires on the same post, excluding, (of course,) the spade start wire, you should be off and running.

wiring issues to starter on Ford 3600

Tractor virgin

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Steve@Advance

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Tractor virgin

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John_PA

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